Comment 6 for bug 557775

So when you add isos, it actually checks them and ungrays everything and works, but if it sees an iso automatically, even though the iso is highlighted, it isn't actually yet checked/validated/selected by the program and thus leaves the options grayed out. That would be my guess any way.

It's confusing though because hitting the make startup disk button is still possible, and it tries to create it, but does so much faster than it should, and creates a bad install. This is probably due to it copying the boot files there but failing when it tries to copy the ISO, even when it says the disk was successfully created. Even when you have no ISO selected at all, the make startup disk button is not grayed out, but that's a different bug. Still, both things make this program confusing to use. :P